Peel the potato and cook in boiling water. Mix the flour with the mashed potato, sugar, salt, black ink and fresh yeast melted in half glass of warm water. Work the dough with more warm water until you get a soft dough with no lumps. Put the dough in a warm place and let it rise for about 45 minutes, until it has doubled the size. Lightly oil a oven pan, lay the dough and garnish as you wish, drizzle with more olive oil and cook at 200 C for about 30 minutes.